Plasticity happens when the atoms slip when they break bonds and reform new ones.
Stress strain curve of metals ceramics and polymers.
Stress strain curve is the plot of stress and strain of a material or metal on the graph.
Based on the mentioned properties.
The stress shown in is an example of a textfigure 6 2 book stress strain curve.
Difference between metals ceramics and polymers with respect to modulus and tensile strengths the modulus values for highly elastic polymeric materials are lower than those of metals.
In this the stress is plotted on the y axis and its corresponding strain on the x axis.
This stress curve is typical for ductile metallic elements.
Stress strain curves for two brittle materials.
Elastic energy ductile fracture.
Many ductile materials including some metals polymers and ceramics exhibit a yield point.
Metallic bonding is great for this sort of re bonding which is why metals are usually ductile.
The yield point is the maximum of the stress strain curve the weird circle symbol.
Stress strain curves for metals ceramics and polymers objective we are interested about studying and comparing stress strain curves of metals ceramics and polymers.
Primarily differences are due to their different chemical bonding properties homework 1.
Elasticity ductility and tensile strength those four materials can be simplified by these definitions.
While some of the stress strain curves for polymers might look similar to ones for metals polymers are mechanically different than metals or ceramics.
Elastic plastic energy very small toughness unreinforced polymers engineering tensile strain ε engineering tensile stress σ small toughness ceramics large toughness metals adapted from fig.
For brittle ceramics a three point bending apparatus shown in the figure below is used determine the stress strain behavior and the measurement results are used to calculate an equivalent modulus of elasticity.
A highly elastic polymer may stretch over 10 times the original length before breaking while a metal might elastically stretch 10 of the original length elastically and may stretch plastically to double the original length before reaching its fracture point.
Approximate by the area under the stress strain curve brittle fracture.
The linear portion of the curve is the elastic region and the slope is the modulus of elasticity or young s modulus.
It makes them dense and eventuall.
A typical stress strain curve would look like figure 6 2strain curve.
The stress strain curve for metals ceramics and polymers the curve i have shown you is a typical curve for ductile materials.
Low carbon steel generally exhibits a very linear stress strain relationship up to a well defined yield point fig 1.
